PDF malware analysis — malicious · 843233cdd2b1e208

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 20:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 1226d927b8083c59c2ab040fc3ec0a38 SHA-1: 5c64dd0466c0f1b0c2ec3426887b8e5b52e7782b SHA-256: 843233cdd2b1e208081d23fc9f15c85b920f80596fdfa12946c9bb73ea68a8c1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c56c8ab7e03dd7fdfe3d63f76ff5b437/30319835223.pdf In PDF document text
- http://liubeauty.com/luutru/files/13747848600.pdfIn PDF document text
- http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/doxebejubolajelinuvi.pdfIn PDF document text
- http://annabarons.lv/files/files/setejo.pdfIn PDF document text
- http://tfh-filter.hu/_user/file/jemigitilewajikawuvewuv.pdfIn PDF document text
- http://crocepadrekolbe.it/userfiles/files/73910242183.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329fbe5b009---28097581720.pdfIn PDF document text
- http://masan315.net/board/imagefile/file/zafav.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc270c35d---83927523797.pdfIn PDF document text
- http://artpolyclinic.com/file/files/47112690500.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613247bb210f6---16786089492.pdfIn PDF document text
- http://antonio-pelella.eu/userfiles/files/96300179106.pdfIn PDF document text
- https://detectagsafety.com/ckfinder/userfiles/files/1911130334.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8397565c372c6e9cfe7346fa33ab48d5/wivorejemipitu.pdfIn PDF document text
- http://spamsmsgiare.com/media/ftp/file/68509409238.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aeced9467---vinodejavuwenax.pdfIn PDF document text
- https://dianthusindustrial.com/resimler/files/8084108009.pdfIn PDF document text
- https://bnovum.hu/downloads/winuzagelizonure.pdfIn PDF document text
- https://tongdaidoanhnghiep.com/app/webroot/upload/files/63026176762.pdfIn PDF document text
- https://saigonservices.vn/images/uploads/files/jofekakivegewujoximik.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/61716ce2d2dab14619d9a9157c91e354/77683339640.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613416d2f2414---jalurotukemur.pdfIn PDF document text
- https://shastriratanchatterjee.com/ckfinder/userfiles/files/73251695824.pdfIn PDF document text
- https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/41482201186.pdfIn PDF document text
- http://ambulatorioveterinariocamali.com/userfiles/files/20969211394.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=setup+and+transfer+app+on+androidPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d747.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD747	10620 bytes
SHA-256: `e54c34471da39395737d0ff2c937f19901f6f50122e618da3d354c14587daf40`
`font_01_sfnt_off0000efa3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFA3	17000 bytes
SHA-256: `ca873b2a60cf72615c98cf4a409303519d19ac22bd69dcf422557a068edf39f5`
`font_02_sfnt_off00011bbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BBF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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